Parking air conditioner and control method and device thereof, storage medium and program product

Abstract

The invention discloses a control method and device of a parking air conditioner, the parking air conditioner, a storage medium and a computer program product, and the method comprises the steps that when the parking air conditioner operates in a refrigeration mode, the size of an indoor load is determined according to the air inlet temperature and the air outlet temperature of an indoor unit and the indoor environment temperature; and the compressor frequency is controlled according to the indoor load, the indoor environment temperature and the pipe temperature of the indoor unit. According to the scheme, an outer ring temperature sensing bulb and an exhaust temperature sensing bulb on an outer unit of the parking air conditioner are omitted, so that the design of the parking air conditioner can be more miniaturized, and the occupied space is reduced; meanwhile, the compressor frequency is controlled according to the indoor unit inlet and outlet air temperature and the inner ring temperature, the energy-saving effect in the air conditioner refrigeration process is improved, and reliable operation of the system is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to a control method, a device, a parking air conditioner, a storage medium, and a computer program product for a parking air conditioner. Background Art

[0002] With the rapid development of the logistics industry, truck drivers have relatively high demands for the comfort and power consumption of parking air conditioners. The industry faces challenges in miniaturized design, simplified design, and intelligent control of the compressor operating frequency based on the vehicle-mounted battery power. Most solutions control the frequency by setting an external environment temperature sensor and an exhaust temperature sensor on the outdoor unit, resulting in complex wiring, large occupied space, high cost, and being not conducive to miniaturization on the outdoor unit.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method, a device, a parking air conditioner, a storage medium, and a computer program product for a parking air conditioner, so as to solve the problems in related solutions that the frequency control of the parking air conditioner outdoor unit by setting an external environment temperature sensor and an exhaust temperature sensor leads to complex wiring, large occupied space, high cost, and being not conducive to miniaturization on the outdoor unit, and achieve the effect of making the design of the parking air conditioner more miniaturized, reducing the occupied space; at the same time, controlling the compressor frequency according to the inlet and outlet air temperatures and the inner ring temperature of the indoor unit, improving the energy-saving effect during the air-conditioning refrigeration process, and ensuring the reliable operation of the system.

[0005] The present invention provides a control method for a parking air conditioner, including: during the refrigeration operation of the parking air conditioner, obtaining the inlet air temperature and the outlet air temperature of the indoor unit of the parking air conditioner, the indoor environment temperature, and the pipe temperature of the indoor unit; determining the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor environment temperature; controlling the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor environment temperature, and the pipe temperature of the indoor unit.

[0006] In some embodiments, determining the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor environment temperature includes: calculating a temperature difference correction value according to the inlet air temperature, the outlet air temperature, and the indoor environment temperature; judging the magnitude of the temperature difference correction value; if the temperature difference correction value is within a first temperature difference range, determining that the indoor load is a low load; if the temperature difference correction value is within a second temperature difference range, determining that the indoor load is a medium load; if the temperature difference correction value is within a third temperature difference range, determining that the indoor load is a high load; wherein, the first temperature difference range < the second temperature difference range < the third temperature difference range.

[0007] In some embodiments, the formula for calculating the temperature difference correction value is:

[0008]

[0009] where ΔT 修 is the temperature difference correction value; ΔT 出 1 = |T 设 - T 出 |, ΔT 出 2 = |T 内 - T 出 |, ΔT 进 1 = |T 设 - T 进 |, ΔT 进 2 = |T 内 - T 进 |, T 内 is the indoor environmental temperature, T 出 is the outlet air temperature, T 进 is the inlet air temperature, T 设 is the set temperature; k is a coefficient.

[0010] In some embodiments, according to the magnitude of the indoor load, the indoor environmental temperature, and the pipe temperature of the indoor unit, controlling the frequency of the compressor of the parking air conditioner includes: when the indoor load is a low load, controlling the frequency of the compressor to be a preset first frequency; after the compressor operates at the preset first frequency for a preset first time, determining the magnitude relationship between the indoor environmental temperature and the set temperature; if the indoor environmental temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor environmental temperature is greater than the set temperature, determining the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is within a first temperature range or a second temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is within a third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; where the first temperature range > the second temperature range > the third temperature range.

[0011] In some embodiments, the frequency of the compressor of the parking air conditioner is controlled according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit, and further includes: when the indoor load is a medium load, controlling the frequency of the compressor to a preset second frequency; after the compressor operates at the preset second frequency for a preset second time, judging the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, judging the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is within a first temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is within a second temperature range, controlling the frequency of the compressor to a preset first frequency; if the pipe temperature of the indoor unit is within a third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; wherein, the first temperature range > the second temperature range > the third temperature range, and the preset first frequency < the preset second frequency.

[0012] In some embodiments, the frequency of the compressor of the parking air conditioner is controlled according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit, and further includes: when the indoor load is a high load, controlling the frequency of the compressor to a preset third frequency; after the compressor operates at the preset third frequency for a preset third time, judging the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, judging the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is within a first temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is within a second temperature range, controlling the frequency of the compressor to a preset second frequency; if the pipe temperature of the indoor unit is within a third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; wherein, the first temperature range > the second temperature range > the third temperature range, and the preset second frequency < the preset third frequency.

[0013] Matched with the above method, on the other hand, the present invention provides a control device for an air conditioner, including: an acquisition unit configured to acquire the inlet air temperature and the outlet air temperature of the indoor unit of the parking air conditioner, the indoor ambient temperature, and the pipe temperature of the indoor unit during the refrigeration operation of the parking air conditioner; a control unit configured to determine the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor ambient temperature; the control unit is further configured to control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit.

[0014] In some embodiments, the control unit determines the magnitude of the indoor load based on the inlet air temperature, the outlet air temperature, and the indoor ambient temperature, including: calculating a temperature difference correction value based on the inlet air temperature, the outlet air temperature, and the indoor ambient temperature; determining the magnitude of the temperature difference correction value; if the temperature difference correction value is within a first temperature difference range, determining that the indoor load is a low load; if the temperature difference correction value is within a second temperature difference range, determining that the indoor load is a medium load; if the temperature difference correction value is within a third temperature difference range, determining that the indoor load is a high load; wherein, the first temperature difference range < the second temperature difference range < the third temperature difference range.

[0015] In some embodiments, the formula for calculating the temperature difference correction value is:

[0016]

[0017] wherein, ΔT 修 is the temperature difference correction value; ΔT 出 1 = |T 设 - T 出 |, ΔT 出 2 = |T 内 - T 出 |, ΔT 进 1 = |T 设 - T 进 |, ΔT 进 2 = |T 内 - T 进 |, T 内 is the indoor ambient temperature, T 出 is the outlet air temperature, T 进 is the inlet air temperature, T 设 is the set temperature; k is a coefficient.

[0018] In some embodiments, the control unit controls the frequency of the compressor of the parking air conditioner based on the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit, including: when the indoor load is a low load, controlling the frequency of the compressor to be a preset first frequency; after the compressor operates at the preset first frequency for a preset first time, determining the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, determining the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is within a first temperature range or a second temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is within a third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; wherein, the first temperature range > the second temperature range > the third temperature range.

[0019] In some embodiments, the control unit controls the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit, and further includes: when the indoor load is medium load, controlling the frequency of the compressor to be a preset second frequency; after the compressor operates at the preset second frequency for a preset second time, determining the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, determining the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is within the first temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is within the second temperature range, controlling the frequency of the compressor to be a preset first frequency; if the pipe temperature of the indoor unit is within the third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; wherein, the first temperature range > the second temperature range > the third temperature range, and the preset first frequency < the preset second frequency.

[0020] In some embodiments, the control unit controls the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit, and further includes: when the indoor load is high load, controlling the frequency of the compressor to be a preset third frequency; after the compressor operates at the preset third frequency for a preset third time, determining the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, determining the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is within the first temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is within the second temperature range, controlling the frequency of the compressor to be a preset second frequency; if the pipe temperature of the indoor unit is within the third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; wherein, the first temperature range > the second temperature range > the third temperature range, and the preset second frequency < the preset third frequency.

[0021] Matched with the above device, on the other hand, the present invention provides a parking air conditioner, including: the control device of the air conditioner described above.

[0022] Matched with the above method, on the other hand, the present invention provides a storage medium, the storage medium includes a stored program, wherein, when the program runs, it controls the device where the storage medium is located to execute the control method of the parking air conditioner described above.

[0023] Matched with the above method, on the other hand, the present invention provides a computer program product, the computer program product includes a computer program, and when the computer program product is processed and executed, it implements the steps of the control method of the parking air conditioner described above.

[0024] In the solution of the present invention, during the refrigeration operation of the parking air conditioner, the indoor load is determined according to the inlet air temperature, outlet air temperature, and indoor environment temperature of the indoor unit; the compressor frequency is controlled according to the size of the indoor load, indoor environment temperature, and pipe temperature of the indoor unit. By canceling the outer ring temperature sensor and exhaust temperature sensor on the outdoor unit of the parking air conditioner, the design of the parking air conditioner can be made more compact, reducing the occupied space; at the same time, the compressor frequency is controlled according to the inlet and outlet air temperatures of the indoor unit and the inner ring temperature, improving the energy-saving effect during the air-conditioning refrigeration process and ensuring the reliable operation of the system.

[0025] Other features and advantages of the present invention will be described in the following specification, and partly will become obvious from the specification, or will be understood by implementing the present invention.

[0026] The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. Description of the Drawings

[0027] Figure 1 It is a schematic flowchart of an embodiment of the control method of the parking air conditioner of the present invention;

[0028] Figure 2 It is a schematic structural diagram of an embodiment of the control device of the air conditioner of the present invention;

[0029] Figure 3 It is a schematic flowchart of another embodiment of the control method of the parking air conditioner of the present invention;

[0030] Figure 4 It is a schematic flowchart of controlling the compressor frequency according to the temperature correction value and the inner pipe temperature.

[0031] Combined with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0032] 102 - Acquisition unit; 104 - Control unit. Detailed Embodiments

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0034] According to an embodiment of the present invention, a control method for a parking air conditioner is provided, as Figure 1Schematic flow diagram of an embodiment of the method of the present invention. The control method of the parking air conditioner may include: step S110 to step S130.

[0035] In step S110, during the refrigeration operation of the parking air conditioner, obtain the inlet air temperature and outlet air temperature of the indoor unit of the parking air conditioner, the indoor environmental temperature, and the pipe temperature of the indoor unit.

[0036] Temperature sensors are respectively arranged at the air inlet and outlet of the indoor unit of the parking air conditioner to collect the inlet air temperature and outlet air temperature during the refrigeration operation of the air conditioner in real time. The indoor environmental temperature is the temperature inside the vehicle where the parking air conditioner is located.

[0037] In step S120, determine the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor environmental temperature.

[0038] The changes in the inlet air temperature, the outlet air temperature, and the indoor environmental temperature can directly reflect the heat exchange efficiency of the air conditioner and the actual heat demand indoors. Specifically, the higher the inlet air temperature, the higher the actual temperature and the indoor load. The outlet air temperature reflects the cooling capacity currently output by the air conditioner. The lower the outlet air temperature, the higher the refrigeration efficiency of the evaporator and the greater the cooling capacity output per unit time. The indoor environmental temperature can be regarded as the indoor average temperature and is used together with the inlet air temperature to judge the uniformity of the indoor temperature field.

[0039] In some embodiments, in step S120, the specific process of determining the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor environmental temperature includes: calculating a temperature difference correction value according to the inlet air temperature, the outlet air temperature, and the indoor environmental temperature; judging the magnitude of the temperature difference correction value; if the temperature difference correction value is within a first temperature difference range, determine that the indoor load is a low load; if the temperature difference correction value is within a second temperature difference range, determine that the indoor load is a medium load; if the temperature difference correction value is within a third temperature difference range, determine that the indoor load is a high load; wherein, the first temperature difference range < the second temperature difference range < the third temperature difference range.

[0040] The formula for calculating the temperature difference correction value is:

[0041]

[0042] where, ΔT 修 is the temperature difference correction value; ΔT 出 1 = |T 设 - T 出 |, ΔT 出 2 = |T 内 - T 出 |, ΔT 进 1 = |T 设 - T 进|, ΔT 进 2 = |T 内 -T 进 |, T 内 is the indoor ambient temperature, T 出 is the outlet air temperature, T 进 is the inlet air temperature, T 设 is the set temperature; k is a coefficient used to balance the overall calculation result and avoid excessive fluctuations, and its value range is from -0.5 to -1.

[0043] ΔT 进 1 reflects the gap between the current indoor temperature and the target. The greater the deviation, the higher the cooling demand. ΔT 出 1 reflects the gap between the current cooling output of the air conditioner and the target. The greater the deviation, the more obvious the insufficient cooling. ΔT 进 2 reflects the difference between the temperature near the air inlet and the indoor average temperature. The greater the difference, the more uneven the indoor temperature field, and more cooling is required for balance. ΔT 出 2 reflects the actual influence efficiency of the outlet air cooling on the indoor environment. The smaller the difference, the more fully the cooling is diffused and the lower the load.

[0044] The sensing scheme relies on the outdoor unit ambient temperature or the exhaust gas temperature to indirectly judge the load, and cannot directly reflect the actual indoor demand. The formula for calculating the temperature difference correction value in this scheme focuses on the deviation between the indoor temperature and the set value, and is directly related to the user comfort target; through the difference between the outlet air temperature and the indoor temperature, it evaluates the actual influence of the current cooling output of the air conditioner on the indoor environment, and avoids ineffective high-load operation.

[0045] The temperature difference correction value quantifies the indoor load intensity through the deviation ratio relationship. The larger the numerator, the farther the indoor temperature deviates from the set value, or the insufficient cooling output of the air conditioner, and the higher the load. The smaller the denominator, the higher the cooling diffusion efficiency (such as the outlet air cooling quickly reducing the indoor temperature), and the lower the load; conversely, the larger the denominator, the lower the cooling transfer efficiency, and higher load compensation is required. Therefore, when the temperature difference correction value is within the first temperature difference range, it indicates that the indoor side load is very small at this time, and a large amount of cooling is not required to maintain indoor comfort. When the temperature difference correction value is within the second temperature difference range, it indicates that the indoor load is medium at this time, and a certain amount of cooling is required indoors to ensure that the indoor temperature reaches the set temperature. When the temperature difference correction value is within the third temperature difference range, it indicates that the indoor load is very high, and the indoor demand for cooling is very large at this time.

[0046] Judge the indoor load situation according to the magnitude of the temperature difference correction value. By integrating the multi-dimensional deviation ratios of the set temperature and the inlet and outlet air temperatures, and the indoor environment and the inlet and outlet air temperatures, the load level can be accurately quantified, and the compressor frequency can be dynamically matched according to demand. This not only avoids the problem of misjudgment with traditional single parameters, but also balances energy efficiency and refrigeration efficiency. At the same time, relying on the inner pipe temperature detection to enhance the system reliability, it can also get rid of the dependence on the outdoor unit sensor to simplify the hardware and reduce costs, meeting the requirements of the miniaturization of the parking air conditioner and complex working conditions.

[0047] At step S130, control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor environment temperature, and the pipe temperature of the indoor unit.

[0048] On the premise of realizing air-conditioning refrigeration and energy conservation, this solution cancels the outer ring temperature sensor and the exhaust temperature sensor on the outdoor unit of the parking air conditioner, reducing the two wires connected to the main board of the electrical box, making the design of the parking air conditioner more miniaturized and reducing the occupied space. Without collecting the outer ring temperature and the exhaust temperature, control the compressor frequency according to the inlet and outlet air temperatures of the indoor unit and the inner ring temperature, improving the energy conservation effect during the air-conditioning refrigeration process and ensuring the reliable operation of the system.

[0049] In some embodiments, in step S130, the specific process of controlling the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor environment temperature, and the pipe temperature of the indoor unit includes: when the indoor load is a low load, control the frequency of the compressor to be a preset first frequency; after the compressor operates at the preset first frequency for a preset first time, judge the magnitude relationship between the indoor environment temperature and the set temperature; if the indoor environment temperature is less than or equal to the set temperature, control the compressor to stop; if the indoor environment temperature is greater than the set temperature, judge the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is in the first temperature range or the second temperature range, keep the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is in the third temperature range, control the compressor to stop to prevent the indoor unit from freezing; where the first temperature range > the second temperature range > the third temperature range.

[0050] The first temperature range is (T 防冻结保护降频 , T 防冻结保护禁频 , the second temperature range is (T 防冻结保护停机 , T 防冻结保护降频 , and the third temperature range is the range less than or equal to T 防冻结保护停机 . T 防冻结保护禁频 > T 防冻结保护降频 > T 防冻结保护停机 , and the value ranges are all 0 to 6 °C. For T 防冻结保护禁频 , when the inner pipe temperature is higher than T 防冻结保护禁频When it indicates that the evaporator is in a safe operating state, the compressor is allowed to operate at any frequency; for T 防冻结保护降频 When the inner tube temperature drops to T 防冻结保护降频 When it is reached, the compressor frequency needs to be reduced to decrease the cooling output and avoid the temperature from further dropping into the freezing risk range; for T 防冻结保护停机 When the inner tube temperature is lower than T 防冻结保护停机 When it is reached, the evaporator is in a state with extremely high freezing risk, and the compressor must be forced to stop. The preset first frequency is the frequency at the low gear.

[0051] When the indoor load is low, the indoor temperature is close to or reaches the set temperature, and a large amount of cooling is not required to maintain comfort. Therefore, the compressor operates at the preset first frequency, which is relatively low, to output cooling with the minimum energy consumption and avoid energy waste caused by high-frequency operation. After operating at this frequency for the preset first time, it is detected whether the indoor temperature reaches the set temperature. If it reaches, the compressor is directly controlled to stop and refrigeration is stopped; if it does not reach, the inner tube temperature is further detected to determine whether there is a freezing risk in the system. Since the preset first frequency is a relatively low frequency, further reducing the frequency may not ensure the normal refrigeration operation of the air conditioner. Therefore, the frequency is not reduced when the inner tube temperature is within the second temperature range.

[0052] Specifically, when T 防冻结保护停机 <T 内管 ≤T 防冻结保护禁频 When it is reached, the compressor still operates at the original frequency until the room temperature reaches the set temperature and then stops; when T 内管 ≤T 防冻结保护停机 When it is reached, the inner tube temperature is already lower than the anti-freezing protection shutdown temperature. To prevent the trigger of the evaporator anti-freezing protection command, the compressor must stop to ensure the reliability of the system.

[0053] In some embodiments, in step S130, the specific process of controlling the frequency of the compressor of the parking air conditioner according to the size of the indoor load, the indoor ambient temperature, and the tube temperature of the indoor unit further includes: when the indoor load is medium, controlling the frequency of the compressor to be the preset second frequency; after the compressor operates at the preset second frequency for the preset second time, judging the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, judging the magnitude of the tube temperature of the indoor unit; if the tube temperature of the indoor unit is within the first temperature range, keeping the frequency of the compressor unchanged; if the tube temperature of the indoor unit is within the second temperature range, controlling the frequency of the compressor to be the preset first frequency; if the tube temperature of the indoor unit is within the third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; where the first temperature range > the second temperature range > the third temperature range, and the preset first frequency < the preset second frequency.

[0054] The preset second frequency is the frequency in the medium gear. When the indoor side is at medium load, the compressor operates at the medium gear operating frequency, outputs medium cooling capacity, and balances energy efficiency and refrigeration speed. After operating at this frequency for the preset second time, it is judged whether the room temperature reaches the set temperature. If it reaches, the compressor is directly controlled to stop, and refrigeration stops; if it does not reach, the inner pipe temperature is further detected to judge whether there is a risk of freezing in the system.

[0055] Specifically, if T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , it means that the current operation at the medium gear frequency can not only meet the cooling capacity requirement but also has no freezing risk. The compressor maintains the preset second frequency and continues to operate until it stops after reaching the set temperature. This process quickly cools by continuously operating at the medium gear, improving user comfort; if T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频 , to avoid triggering the evaporator anti-freezing protection, the compressor needs to operate at a reduced frequency to reduce the cooling capacity output and prevent the temperature from further decreasing. After reducing the frequency, it continues to operate until the indoor temperature reaches the target temperature and stops; if T 内管 ≤T 防冻结保护停机 , at this time, the evaporator faces a freezing risk. To ensure the reliability of the system, the compressor is forced to stop to avoid hardware damage caused by too low temperature.

[0056] In some embodiments, in step S130, the specific process of controlling the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit further includes: when the indoor load is a high load, controlling the frequency of the compressor to be a preset third frequency; after the compressor operates at the preset third frequency for a preset third time, judging the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, judging the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is in the first temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is in the second temperature range, controlling the frequency of the compressor to be the preset second frequency; if the pipe temperature of the indoor unit is in the third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; wherein, the first temperature range > the second temperature range > the third temperature range, and the preset second frequency < the preset third frequency.

[0057] The third frequency is preset as the frequency at the high-end position. When the indoor side is under high load, the indoor demand for cooling is extremely high, and rapid cooling is required through high-frequency operation. The system directly controls the compressor to operate at the highest frequency, outputs the maximum cooling capacity, and shortens the time for the indoor temperature to drop to the set value as much as possible. After running at this frequency for the preset third time, it is determined whether the room temperature reaches the set temperature. If it reaches it, the compressor is directly controlled to stop and stop cooling; if it does not reach it, the internal pipe temperature is further detected to determine whether the system is at risk of freezing.

[0058] Specifically, if T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , indicating that the inner tube temperature is in a safe range, far from the freezing threshold, and the compressor maintains the preset third frequency and continues to operate. Under the premise of ensuring the safety of the evaporator, the high-frequency refrigeration efficiency is maximized, the user waiting time is shortened, and the comfort level is improved. If T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频 , the inner tube temperature has dropped to the warning range. Although the shutdown protection has not been triggered, continued high-frequency operation may cause the temperature to drop further. At this time, the compressor frequency is reduced to the preset second frequency, which can reduce the cooling output and avoid freezing, and can also use the remaining load demand to complete the refrigeration, balancing efficiency and reliability. 内管 ≤T 防冻结保护停机 , the inner tube temperature is lower than the critical safety value, and the evaporator surface is facing the risk of freezing. At this time, stop the compressor immediately and cut off the cooling output to prevent the evaporator from freezing and damaging the hardware.

[0059] Figure 3 FIG. 1 is a flow chart of another embodiment of a method for controlling a parking air conditioner according to the present invention. Figure 3 As shown, the method includes:

[0060] Step 1: After the parking air conditioner is running, obtain the air inlet temperature T 进 , outlet temperature T 出 , Indoor ambient temperature T 内 , set temperature T 设 Calculate ΔT 进 1=|T 设 -T 进 |,ΔT 出 1=|T 设 -T 出 |,ΔT 进2 =|T 内 -T 进 |,ΔT 出 2=|T 内 -T 出 ∣, temperature difference correction value ΔT 修 =ΔT 出 1 / ΔT出 2 + ΔT 进 1 / ΔT 进 2 + K。

[0061] Step 2, compare ΔT 修 with the set values ΔT1, ΔT2, ΔT3, and control the operating frequency F of the parking air - conditioner compressor according to the comparison result.

[0062] Step 3, after the compressor operates at frequency F for t time, detect whether T 内 reaches T 设 . If T 内 reaches T 设 , then control the compressor to stop. If T 内 does not reach T 设 , then detect the inner tube temperature T 内管 at this time, compare it with T 防冻结保护停机 , T 防冻结保护降频 , T 防冻结保护禁频 , and control the compressor frequency again according to the comparison result to ensure the reliability of the system.

[0063] Figure 4 is a schematic flow chart for controlling the compressor frequency based on the temperature correction value and the inner tube temperature. The specific processes of the above - mentioned Step 2 and Step 3, as Figure 4 shown, include:

[0064] Step 11, compare ΔT 修 with the set values ΔT1, ΔT2, ΔT3. When ΔT 修 <ΔT1, execute Step 12; when ΔT1 ≤ ΔT 修 <ΔT2, execute Step 13; when ΔT2 ≤ ΔT 修 <ΔT3, execute Step 14; when ΔT 修 ≥ΔT3, execute Step 15.

[0065] Step 12, ΔT 修 <ΔT1, the load on the inner side of the cab is very small, and at this time, a large amount of cooling capacity is not required to maintain the indoor comfort. Then control the compressor to operate at a low - gear (1st gear) frequency F1 for t1 time. If T set has reached at this time, the compressor stops; if T set still has not reached at this time, detect the inner tube temperature T 内管 at this time.

[0066] If T 防冻结保护停机 <T 内管 ≤T 防冻结保护禁频 , the inner tube temperatures at this time are all within the normal range, and the compressor can still meet the indoor cooling capacity demand by operating at the original operating frequency; if T 内管 ≤T 防冻结保护停机, at this time, the temperature of the inner tube has dropped below the anti-freezing protection shutdown temperature. To prevent the triggering of the evaporator anti-freezing protection command, the compressor must be shut down to ensure the reliability of the system.

[0067] Step 13, ΔT1 ≤ ΔT 修 <ΔT2, the load on the inner side of the cab is low, in the medium-low range. The compressor can meet the cooling demand in the room at a medium gear (2nd gear) operating frequency. After the compressor runs at frequency F2 for t2 time, if T 设 has been reached, the compressor shuts down; if T 设 has not been reached yet, detect the temperature T 内管 of the inner tube at this time.

[0068] If T 防冻结保护降频 <T 内管 ≤ T 防冻结保护禁频 , at this time, the temperatures of the inner tubes are all within the normal range, and the temperature of the inner tube is not low. The evaporator anti-freezing protection command will not be triggered, and the compressor still runs at the original operating frequency. In this way, it can not only meet the cooling demand in the room, but also continue to run at the medium gear frequency to cool down quickly and improve user comfort; if T 防冻结保护停机 <T 内管 ≤ T 防冻结保护降频 , at this time, the temperature of the inner tube has dropped. Although it is still within the safe range, in order not to trigger the evaporator anti-freezing protection command, it is reliable for the compressor to run at a downshifted frequency at this time. The operating frequency of the compressor is downshifted to the 1st gear until the indoor temperature reaches the target temperature and shuts down; if T 内管 ≤ T 防冻结保护停机 , at this time, the temperature of the inner tube has dropped below the anti-freezing protection shutdown temperature. To prevent the triggering of the evaporator anti-freezing protection command, the compressor must be shut down to ensure the reliability of the system.

[0069] Step 14, ΔT2 ≤ ΔT 修 <ΔT3, the load in the cab is high, in the medium-high range. At this time, the cooling demand in the room is large, and the first two operating frequencies cannot meet the rapid cooling. Control the compressor to run at a medium-high gear (3rd gear) frequency F3 for t3 time. If T 设 has been reached, the compressor shuts down; if T 设 has not been reached yet, detect the temperature T 内管 of the inner tube at this time.

[0070] If T 防冻结保护降频 <T 内管 ≤ T 防冻结保护禁频 , at this time, the temperatures of the inner tubes are all within the normal range, and the temperature of the inner tube is not low. The evaporator anti-freezing protection command will not be triggered, and the compressor still runs at the original operating frequency; if T 防冻结保护停机 <T 内管 ≤ T 防冻结保护降频, at this time, the temperature of the inner tube has decreased. Although it is still within the safe range, in order to prevent the anti-freezing protection command of the evaporator from being triggered, it is necessary to reduce the operating frequency of the compressor to a lower gear for reliable operation. The operating frequency of the compressor is reduced to the second gear until the indoor temperature reaches the set temperature and the compressor stops; if T 内管 ≤T 防冻结保护停机 , at this time, the temperature of the inner tube is already lower than the anti-freezing protection shutdown temperature. In order to prevent the anti-freezing protection command of the evaporator from being triggered, the compressor must stop to ensure the reliability of the system.

[0071] Step 15, ΔT 修 ≥ΔT3, the load in the cab is very high. At this time, the demand for cooling in the room is very large, and the first three gear operating frequencies can no longer meet the rapid cooling. Then control the compressor to operate at the high gear (the fourth gear) frequency F4 for t4 time. If T 设 has been reached, the compressor stops; if T 设 has not been reached yet, detect the temperature T of the inner tube at this time 内管 .

[0072] If T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , at this time, the temperature of the inner tube is within the normal range, and the temperature of the inner tube is not too low, so the anti-freezing protection command of the evaporator will not be triggered, and the compressor still operates at the original operating frequency; if T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频 , at this time, the temperature of the inner tube has decreased. Although it is still within the safe range, in order to prevent the anti-freezing protection command of the evaporator from being triggered, it is necessary to reduce the operating frequency of the compressor to a lower gear for reliable operation. The operating frequency of the compressor is reduced to the second gear; if T 内管 ≤T 防冻结保护停机 , at this time, the temperature of the inner tube is already lower than the anti-freezing protection shutdown temperature. In order to prevent the anti-freezing protection command of the evaporator from being triggered, the compressor must stop to ensure the reliability of the system.

[0073] Adopting the technical solution of this embodiment, during the refrigeration operation of the parking air conditioner, the size of the indoor load is determined according to the inlet air temperature, outlet air temperature, and indoor ambient temperature of the indoor unit; the compressor frequency is controlled according to the size of the indoor load, indoor ambient temperature, and the tube temperature of the indoor unit. By canceling the outer ring temperature sensor and the exhaust temperature sensor on the outdoor unit of the parking air conditioner, the design of the parking air conditioner can be made more miniaturized, reducing the occupied space; at the same time, the compressor frequency is controlled according to the indoor inlet and outlet air temperatures and the inner ring temperature, improving the energy-saving effect during the air-conditioning refrigeration process and ensuring the reliable operation of the system.

[0074] According to an embodiment of the present invention, there is also provided a control device for an air conditioner corresponding to the control method of the parking air conditioner. Refer to Figure 2Schematic structural diagram of an embodiment of the device of the present invention. The control device of the air conditioner may include: an acquisition unit 120 and a control unit 104.

[0075] An acquisition unit 102, configured to acquire the inlet air temperature, the outlet air temperature, the indoor environment temperature, and the pipe temperature of the indoor unit of the parked vehicle air conditioner during the refrigeration operation of the parked vehicle air conditioner.

[0076] Temperature sensors are respectively arranged at the air inlet and outlet of the indoor unit of the parked vehicle air conditioner to collect the inlet air temperature and the outlet air temperature during the refrigeration operation of the air conditioner in real time. The indoor environment temperature is the temperature inside the vehicle where the parked vehicle air conditioner is located.

[0077] A control unit 104, configured to determine the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor environment temperature.

[0078] The changes in the inlet air temperature, the outlet air temperature, and the indoor environment temperature can directly reflect the heat exchange efficiency of the air conditioner and the actual heat demand indoors. Specifically, the higher the inlet air temperature, the higher the actual temperature and the indoor load. The outlet air temperature reflects the cold quantity output by the air conditioner currently. The lower the outlet air temperature, the higher the refrigeration efficiency of the evaporator and the greater the cold quantity output per unit time. The indoor environment temperature can be regarded as the average indoor temperature and is used together with the inlet air temperature to judge the uniformity of the indoor temperature field.

[0079] In some embodiments, the specific process of the control unit 104 for determining the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor environment temperature includes: calculating a temperature difference correction value according to the inlet air temperature, the outlet air temperature, and the indoor environment temperature; judging the magnitude of the temperature difference correction value; if the temperature difference correction value is within a first temperature difference range, determining that the indoor load is a low load; if the temperature difference correction value is within a second temperature difference range, determining that the indoor load is a medium load; if the temperature difference correction value is within a third temperature difference range, determining that the indoor load is a high load; wherein, the first temperature difference range < the second temperature difference range < the third temperature difference range.

[0080] The formula for calculating the temperature difference correction value is:

[0081]

[0082] wherein, ΔT 修 is the temperature difference correction value; ΔT 出 1 = |T 设 - T 出 |, ΔT 出 2 = |T 内 - T 出 |, ΔT 进 1 = |T 设 - T进 |, ΔT 进 2 = |T 内 -T 进 |, T 内 is the indoor ambient temperature, T 出 is the outlet air temperature, T 进 is the inlet air temperature, T 设 is the set temperature; k is a coefficient used to balance the overall calculation result and avoid excessive fluctuations, and its value range is from -0.5 to -1.

[0083] ΔT 进 1 reflects the gap between the current indoor temperature and the target. The greater the deviation, the higher the cooling demand. ΔT 出 1 reflects the gap between the current cooling output of the air conditioner and the target. The greater the deviation, the more obvious the insufficient cooling. ΔT 进 2 reflects the difference between the temperature near the air inlet and the indoor average temperature. The greater the difference, the more uneven the indoor temperature field, and more cooling is required for balance. ΔT 出 2 reflects the actual influence efficiency of the outlet air cooling on the indoor environment. The smaller the difference, the more fully the cooling is diffused and the lower the load.

[0084] The sensing scheme relies on the outdoor unit ambient temperature or the exhaust gas temperature to indirectly judge the load and cannot directly reflect the actual indoor demand. The formula for calculating the temperature difference correction value in this scheme focuses on the deviation between the indoor temperature and the set value and is directly related to the user comfort target; by the difference between the outlet air temperature and the indoor temperature, it evaluates the actual influence of the current cooling output of the air conditioner on the indoor environment and avoids ineffective high-load operation.

[0085] The temperature difference correction value quantifies the indoor load intensity through the deviation proportional relationship. The larger the numerator, the farther the indoor temperature deviates from the set value, or the insufficient cooling output of the air conditioner, and the higher the load. The smaller the denominator, the higher the cooling diffusion efficiency (such as the outlet air cooling quickly reducing the indoor temperature), and the lower the load; conversely, the larger the denominator, the lower the cooling transfer efficiency, and higher load compensation is required. Therefore, when the temperature difference correction value is within the first temperature difference range, it indicates that the indoor-side load is very small at this time and a large amount of cooling is not required to maintain indoor comfort. When the temperature difference correction value is within the second temperature difference range, it indicates that the indoor load is medium at this time and a certain amount of cooling is required indoors to ensure that the indoor temperature reaches the set temperature. When the temperature difference correction value is within the third temperature difference range, it indicates that the indoor load is very high and the indoor demand for cooling is very large at this time.

[0086] Judge the indoor load situation according to the magnitude of the temperature difference correction value. By integrating the multi-dimensional deviation ratios of the set temperature and the inlet and outlet air temperatures, and the indoor environment and the inlet and outlet air temperatures, the load level can be accurately quantified, and the compressor frequency can be dynamically matched according to demand. This not only avoids the misjudgment problem of traditional single parameters, but also balances energy efficiency and refrigeration efficiency. At the same time, relying on the inner tube temperature detection to enhance the system reliability, it can also get rid of the dependence on the outdoor unit sensor to simplify the hardware and reduce costs, meeting the requirements of the miniaturization of the parking air conditioner and complex working conditions.

[0087] The control unit 104 is further configured to control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the tube temperature of the indoor unit.

[0088] On the premise of realizing air conditioning refrigeration and energy saving, this solution cancels the outer ring temperature sensor and the exhaust temperature sensor on the outdoor unit of the parking air conditioner, reducing the two wires connected to the main board of the electrical box, making the design of the parking air conditioner more miniaturized and reducing the occupied space. Without collecting the outer ring temperature and the exhaust temperature, the compressor frequency is controlled according to the inlet and outlet air temperatures of the indoor unit and the inner ring temperature, improving the energy saving effect during the air conditioning refrigeration process and ensuring the reliable operation of the system.

[0089] In some embodiments, the specific process of the control unit 104 controlling the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the tube temperature of the indoor unit includes: when the indoor load is a low load, controlling the frequency of the compressor to a preset first frequency; after the compressor operates at the preset first frequency for a preset first time, judging the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, judging the magnitude of the tube temperature of the indoor unit; if the tube temperature of the indoor unit is in the first temperature range or the second temperature range, keeping the frequency of the compressor unchanged; if the tube temperature of the indoor unit is in the third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; where the first temperature range > the second temperature range > the third temperature range.

[0090] The first temperature range is (T 防冻结保护降频 , T 防冻结保护禁频 , the second temperature range is (T 防冻结保护停机 , T 防冻结保护降频 , and the third temperature range is the range less than or equal to T 防冻结保护停机 . T 防冻结保护禁频 > T 防冻结保护降频 > T 防冻结保护停机 , and the value ranges are all 0 to 6 °C. For T 防冻结保护禁频 , when the inner tube temperature is higher than T 防冻结保护禁频When it indicates that the working state of the evaporator is safe, the compressor is allowed to operate at any frequency; for T 防冻结保护降频 When the inner tube temperature drops to T 防冻结保护降频 It is necessary to reduce the cooling output by lowering the compressor frequency to avoid the temperature further dropping to the freezing risk range; for T 防冻结保护停机 When the inner tube temperature is lower than T 防冻结保护停机 The evaporator is in a state with extremely high freezing risk and the compressor must be forced to stop. The preset first frequency is the frequency in the low gear.

[0091] When the indoor load is low, the indoor temperature is close to or reaches the set temperature, and comfort can be maintained without a large amount of cooling. Therefore, the compressor operates at a lower preset first frequency to output cooling with the minimum energy consumption and avoid energy waste caused by high-frequency operation. After operating at this frequency for a preset first time, it is detected whether the indoor temperature reaches the set temperature. If it reaches, the compressor is directly controlled to stop and refrigeration stops; if it does not reach, the inner tube temperature is further detected to determine whether there is a freezing risk in the system. Since the preset first frequency is a relatively low frequency, further reducing the frequency may not ensure normal refrigeration operation of the air conditioner. Therefore, the frequency is not reduced when the inner tube temperature is within the second temperature range.

[0092] Specifically, when T 防冻结保护停机 <T 内管 ≤T 防冻结保护禁频 The compressor still operates at the original frequency until the room temperature reaches the set temperature and then stops; when T 内管 ≤T 防冻结保护停机 The inner tube temperature is already lower than the anti-freezing protection shutdown temperature. To prevent triggering the evaporator anti-freezing protection command, the compressor must stop to ensure the reliability of the system.

[0093] In some embodiments, the specific process of the control unit 104 controlling the frequency of the compressor of the parking air conditioner according to the size of the indoor load, the indoor ambient temperature, and the tube temperature of the indoor unit further includes: when the indoor load is medium, controlling the frequency of the compressor to be a preset second frequency; after the compressor operates at the preset second frequency for a preset second time, judging the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, judging the magnitude of the tube temperature of the indoor unit; if the tube temperature of the indoor unit is within the first temperature range, keeping the frequency of the compressor unchanged; if the tube temperature of the indoor unit is within the second temperature range, controlling the frequency of the compressor to be the preset first frequency; if the tube temperature of the indoor unit is within the third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; where the first temperature range > the second temperature range > the third temperature range, and the preset first frequency < the preset second frequency.

[0094] The preset second frequency is the frequency at the medium gear. When the indoor side is at medium load, the compressor operates at the medium gear operating frequency, outputs medium cooling capacity, and balances energy efficiency and cooling speed. After operating at this frequency for the preset second time, it is judged whether the room temperature reaches the set temperature. If it reaches, the compressor is directly controlled to stop, and the refrigeration stops; if it does not reach, the inner pipe temperature is further detected to judge whether there is a risk of freezing in the system.

[0095] Specifically, if T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , it indicates that the current operation at the medium gear frequency can not only meet the cooling capacity requirement but also has no freezing risk. The compressor maintains the preset second frequency and continues to operate until it stops after reaching the set temperature. This process quickly cools by continuously operating at the medium gear, improving user comfort; if T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频 , to avoid triggering the evaporator anti-freezing protection, the compressor needs to operate at a reduced frequency to reduce the cooling capacity output and prevent the temperature from dropping further. After reducing the frequency, it continues to operate until the indoor temperature reaches the target temperature and stops; if T 内管 ≤T 防冻结保护停机 , at this time, the evaporator faces a freezing risk. To ensure the reliability of the system, the compressor is forced to stop to avoid hardware damage caused by too low temperature.

[0096] In some embodiments, the specific process of the control unit 104 for controlling the frequency of the compressor of the parking air conditioner according to the size of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit further includes: when the indoor load is at high load, controlling the frequency of the compressor to be the preset third frequency; after the compressor operates at the preset third frequency for the preset third time, judging the magnitude relationship between the indoor ambient temperature and the set temperature; if the indoor ambient temperature is less than or equal to the set temperature, controlling the compressor to stop; if the indoor ambient temperature is greater than the set temperature, judging the magnitude of the pipe temperature of the indoor unit; if the pipe temperature of the indoor unit is within the first temperature range, keeping the frequency of the compressor unchanged; if the pipe temperature of the indoor unit is within the second temperature range, controlling the frequency of the compressor to be the preset second frequency; if the pipe temperature of the indoor unit is within the third temperature range, controlling the compressor to stop to prevent the indoor unit from freezing; wherein, the first temperature range > the second temperature range > the third temperature range, and the preset second frequency < the preset third frequency.

[0097] The third frequency is preset as the frequency at the high level. When the indoor side is under high load, the indoor demand for cooling is extremely high, and rapid cooling is required through high-frequency operation. The system directly controls the compressor to operate at the highest frequency, outputs the maximum cooling capacity, and shortens the time for the indoor temperature to drop to the set value as much as possible. After running at this frequency for the preset third time, it is determined whether the room temperature reaches the set temperature. If it reaches it, the compressor is directly controlled to stop and stop cooling; if it does not reach it, the internal pipe temperature is further detected to determine whether the system is at risk of freezing.

[0098] Specifically, if T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , indicating that the inner tube temperature is in a safe range, far from the freezing threshold, and the compressor continues to operate at the preset third frequency. Under the premise of ensuring the safety of the evaporator, the high-frequency refrigeration efficiency is maximized, the user waiting time is shortened, and the comfort level is improved. If T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频 , the inner tube temperature has dropped to the warning range. Although the shutdown protection has not been triggered, continued high-frequency operation may cause the temperature to drop further. At this time, the compressor frequency is reduced to the preset second frequency, which can reduce the cooling output and avoid freezing, and can also use the remaining load demand to complete the refrigeration, balancing efficiency and reliability. If T 内管 ≤T 防冻结保护停机 , the inner tube temperature is lower than the critical safety value, and the evaporator surface is facing the risk of freezing. At this time, stop the compressor immediately and cut off the cooling output to prevent the evaporator from freezing and damaging the hardware.

[0099] Figure 3 FIG. 1 is a flow chart of another embodiment of a method for controlling a parking air conditioner according to the present invention. Figure 3 As shown, the method includes:

[0100] Step 1: After the parking air conditioner is running, obtain the air inlet temperature T 进 , outlet temperature T 出 , Indoor ambient temperature T 内 , set temperature T 设 Calculate ΔT 进 1=|T 设 -T 进 |,ΔT 出 1=|T 设 -T 出 |,ΔT 进2 =|T 内 -T 进 |,ΔT 出 2=|T 内 -T 出 ∣, temperature difference correction value ΔT 修 =ΔT 出 1 / ΔT出 2 + ΔT 进 1 / ΔT 进 2 + K。

[0101] Step 2, compare ΔT 修 with the set values ΔT1, ΔT2, ΔT3, and control the operating frequency F of the parking air - conditioner compressor according to the comparison result.

[0102] Step 3, after the compressor operates at frequency F for t time, detect whether T 内 reaches T 设 . If T 内 reaches T 设 , then control the compressor to stop. If T 内 does not reach T 设 , then detect the inner tube temperature T 内管 at this time, compare it with T 防冻结保护停机 , T 防冻结保护降频 , T 防冻结保护禁频 , and control the compressor frequency again according to the comparison result to ensure the reliability of the system.

[0103] Figure 4 is a schematic flow chart for controlling the compressor frequency based on the temperature correction value and the inner tube temperature. The specific processes of the above - mentioned Step 2 and Step 3, as Figure 4 shown, include:

[0104] Step 11, compare ΔT 修 with the set values ΔT1, ΔT2, ΔT3. When ΔT 修 <ΔT1, execute Step 12. When ΔT1 ≤ ΔT 修 <ΔT2, execute Step 13. When ΔT2 ≤ ΔT 修 <ΔT3, execute Step 14. When ΔT 修 ≥ΔT3, execute Step 15.

[0105] Step 12, ΔT 修 <ΔT1, the load on the inner side of the cab is very small. At this time, a large amount of cooling capacity is not required to maintain the indoor comfort. Then control the compressor to operate at a low - gear (1st gear) frequency F1 for t1 time. If T set has reached at this time, the compressor stops. If T set still has not reached at this time, detect the inner tube temperature T 内管 at this time.

[0106] If T 防冻结保护停机 <T 内管 ≤T 防冻结保护禁频 , the inner tube temperatures at this time are all within the normal range, and the compressor can still meet the indoor cooling capacity demand by operating at the original operating frequency. If T 内管 ≤T 防冻结保护停机, at this time, the temperature of the inner pipe has been lower than the anti-freezing protection shutdown temperature. To prevent the triggering of the evaporator anti-freezing protection command, the compressor must be shut down to ensure the reliability of the system.

[0107] Step 13, ΔT1 ≤ ΔT 修 <ΔT2, the load on the inner side of the cab is relatively low. In the medium and low range, the compressor can meet the cooling demand in the room at the medium gear (2nd gear) operating frequency. After the compressor operates at frequency F2 for t2 time, if T 设 has been reached, the compressor shuts down; if T 设 has not been reached yet, detect the temperature T of the inner pipe at this time 内管 .

[0108] If T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , at this time, the temperatures of the inner pipes are all within the normal range, the temperature of the inner pipe is not low, and the evaporator anti-freezing protection command will not be triggered. The compressor still operates at the original operating frequency. In this way, it can not only meet the cooling demand in the room, but also continue to operate at the medium gear frequency to cool down quickly and improve user comfort; if T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频 , at this time, the temperature of the inner pipe has dropped. Although it is still within the safe range, in order to prevent the triggering of the evaporator anti-freezing protection command, it is reliable for the compressor operating frequency to downshift at this time. The compressor operating frequency downshifts to the 1st gear until the room temperature reaches the target temperature and shuts down; if T 内管 ≤T 防冻结保护停机 , at this time, the temperature of the inner pipe has been lower than the anti-freezing protection shutdown temperature. To prevent the triggering of the evaporator anti-freezing protection command, the compressor must be shut down to ensure the reliability of the system.

[0109] Step 14, ΔT2 ≤ ΔT 修 <ΔT3, the load in the cab is relatively high. In the medium and high range, at this time, the cooling demand in the room is relatively large. The first two operating frequencies cannot meet the rapid cooling. Control the compressor to operate at the medium and high gear (3rd gear) frequency F3 for t3 time. If T 设 has been reached, the compressor shuts down; if T 设 has not been reached yet, detect the temperature T of the inner pipe at this time 内管 .

[0110] If T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , at this time, the temperatures of the inner pipes are all within the normal range, the temperature of the inner pipe is not low, and the evaporator anti-freezing protection command will not be triggered. The compressor still operates at the original operating frequency; if T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频, at this time, the temperature of the inner pipe has decreased. Although it is still within the safe range, in order to prevent the anti-freezing protection command of the evaporator from being triggered, the operating frequency of the compressor needs to be downshifted to operate reliably. The operating frequency of the compressor is downshifted to the second gear until the indoor temperature reaches the set temperature and the compressor stops; if T 内管 ≤T 防冻结保护停机 , at this time, the temperature of the inner pipe has dropped below the anti-freezing protection shutdown temperature. In order to prevent the anti-freezing protection command of the evaporator from being triggered, the compressor must stop to ensure the reliability of the system.

[0111] Step 15, ΔT 修 ≥ΔT3, the load in the cab is very high. At this time, the demand for cooling in the room is very large, and the operating frequencies of the first three gears can no longer meet the rapid cooling. Then control the compressor to operate at the high gear (the fourth gear) frequency F4 for t4 time. If T 设 has been reached, the compressor stops; if T 设 has not been reached yet, detect the temperature T of the inner pipe at this time 内管 .

[0112] If T 防冻结保护降频 <T 内管 ≤T 防冻结保护禁频 , at this time, the temperature of the inner pipe is within the normal range, and the temperature of the inner pipe is not too low, so the anti-freezing protection command of the evaporator will not be triggered, and the compressor still operates at the original operating frequency; if T 防冻结保护停机 <T 内管 ≤T 防冻结保护降频 , at this time, the temperature of the inner pipe has decreased. Although it is still within the safe range, in order to prevent the anti-freezing protection command of the evaporator from being triggered, the operating frequency of the compressor still needs to be downshifted to operate reliably, and the operating frequency of the compressor is downshifted to the second gear; if T 内管 ≤T 防冻结保护停机 , at this time, the temperature of the inner pipe has dropped below the anti-freezing protection shutdown temperature. In order to prevent the anti-freezing protection command of the evaporator from being triggered, the compressor must stop to ensure the reliability of the system.

[0113] Since the processing and functions implemented by the device in this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing method, for the details not described in the description of this embodiment, reference may be made to the relevant descriptions in the foregoing embodiments and will not be elaborated here.

[0114] By adopting the technical solution of the present invention, during the refrigeration operation of the parking air conditioner, the size of the indoor load is determined according to the inlet air temperature, outlet air temperature, and indoor ambient temperature of the indoor unit; the compressor frequency is controlled according to the size of the indoor load, indoor ambient temperature, and the pipe temperature of the indoor unit. By canceling the outer ring temperature sensor and the exhaust gas temperature sensor on the outdoor unit of the parking air conditioner, the design of the parking air conditioner can be made more miniaturized, reducing the occupied space; at the same time, the compressor frequency is controlled according to the inlet and outlet air temperatures of the indoor unit and the inner ring temperature, improving the energy-saving effect during the air-conditioning refrigeration process and ensuring the reliable operation of the system.

[0115] According to an embodiment of the present invention, a parking air conditioner corresponding to a control device of an air conditioner is further provided. The parking air conditioner may include: the control device of the air conditioner described above.

[0116] Since the processing and functions implemented by the parking air conditioner in this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing device, for the parts not described in detail in the description of this embodiment, reference may be made to the relevant descriptions in the foregoing embodiments, and details will not be repeated here.

[0117] By adopting the technical solution of the present invention, during the refrigeration operation of the parking air conditioner, the size of the indoor load is determined according to the inlet air temperature, outlet air temperature, and indoor ambient temperature of the indoor unit; the compressor frequency is controlled according to the size of the indoor load, indoor ambient temperature, and pipe temperature of the indoor unit. By canceling the outer ring temperature sensor and the exhaust temperature sensor on the outdoor unit of the parking air conditioner, the design of the parking air conditioner can be made more miniaturized, reducing the occupied space; at the same time, the compressor frequency is controlled according to the inlet and outlet air temperatures of the indoor unit and the inner ring temperature, improving the energy-saving effect during the air-conditioning refrigeration process and ensuring the reliable operation of the system.

[0118] According to an embodiment of the present invention, a storage medium corresponding to a control method of a parking air conditioner is further provided. The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the control method of the parking air conditioner described above.

[0119] Since the processing and functions implemented by the storage medium in this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing method, for the parts not described in detail in the description of this embodiment, reference may be made to the relevant descriptions in the foregoing embodiments, and details will not be repeated here.

[0120] By adopting the technical solution of the present invention, during the refrigeration operation of the parking air conditioner, the size of the indoor load is determined according to the inlet air temperature, outlet air temperature, and indoor ambient temperature of the indoor unit; the compressor frequency is controlled according to the size of the indoor load, indoor ambient temperature, and pipe temperature of the indoor unit. By canceling the outer ring temperature sensor and the exhaust temperature sensor on the outdoor unit of the parking air conditioner, the design of the parking air conditioner can be made more miniaturized, reducing the occupied space; at the same time, the compressor frequency is controlled according to the inlet and outlet air temperatures of the indoor unit and the inner ring temperature, improving the energy-saving effect during the air-conditioning refrigeration process and ensuring the reliable operation of the system.

[0121] According to an embodiment of the present invention, a computer program product corresponding to a control method of a parking air conditioner is further provided. The computer program product includes a computer program, and when the computer program product is processed and executed, it implements the steps of the control method of the above-mentioned parking air conditioner.

[0122] Since the processing and functions implemented by the computer program product of this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing method, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments and will not be elaborated here.

[0123] Adopting the technical solution of the present invention, during the refrigeration operation of the parking air conditioner, the indoor load is determined according to the inlet air temperature, outlet air temperature, and indoor ambient temperature of the indoor unit; the compressor frequency is controlled according to the magnitude of the indoor load, indoor ambient temperature, and pipe temperature of the indoor unit. By canceling the outer ring temperature sensor and exhaust gas temperature sensor on the outdoor unit of the parking air conditioner, the design of the parking air conditioner can be made more miniaturized, reducing the occupied space; at the same time, the compressor frequency is controlled according to the inlet and outlet air temperatures of the indoor unit and the inner ring temperature, improving the energy-saving effect during the air-conditioning refrigeration process and ensuring the reliable operation of the system.

[0124] In summary, it is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0125] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A control method for a parking air conditioner, characterized in that, Including: During the refrigerating operation of the parking air conditioner, obtain the inlet air temperature, outlet air temperature of the indoor unit of the parking air conditioner, indoor ambient temperature, and pipe temperature of the indoor unit; Determine the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor ambient temperature; Control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit.

2. The control method of the parking air conditioner according to claim 1, wherein Determine the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor ambient temperature, including: Calculate a temperature difference correction value according to the inlet air temperature, the outlet air temperature, and the indoor ambient temperature; Judge the magnitude of the temperature difference correction value; If the temperature difference correction value is within a first temperature difference range, determine that the indoor load is a low load; If the temperature difference correction value is within a second temperature difference range, determine that the indoor load is a medium load; If the temperature difference correction value is within a third temperature difference range, determine that the indoor load is a high load; Wherein, the first temperature difference range < the second temperature difference range < the third temperature difference range.

3. The control method of the parking air conditioner according to claim 2, wherein, The formula for calculating the temperature difference correction value is: Among them, ΔT 修 is the temperature difference correction value; ΔT 出 1 = |T 设 - T 出 |, ΔT 出 2 = |T 内 - T 出 |, ΔT 进 1 = |T 设 - T 进 |, ΔT 进 2 = |T 内 - T 进 |, T 内 is the indoor environmental temperature, T 出 is the outlet air temperature, T 进 is the inlet air temperature, T 设 is the set temperature; k is a coefficient.

4. The control method of the parking air conditioner according to claim 2, wherein Control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit, including: When the indoor load is a low load, control the frequency of the compressor to a preset first frequency; After the compressor operates at the preset first frequency for a preset first time, judge the magnitude relationship between the indoor ambient temperature and the set temperature; If the indoor ambient temperature is less than or equal to the set temperature, control the compressor to stop; If the indoor ambient temperature is greater than the set temperature, judge the magnitude of the pipe temperature of the indoor unit; If the pipe temperature of the indoor unit is within a first temperature range or a second temperature range, keep the frequency of the compressor unchanged; If the pipe temperature of the indoor unit is within a third temperature range, control the compressor to stop to prevent the indoor unit from freezing; Wherein, the first temperature range > the second temperature range > the third temperature range.

5. The control method of the parking air conditioner according to claim 2, characterized in that, Control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit, further including: When the indoor load is a medium load, control the frequency of the compressor to a preset second frequency; After the compressor operates at the preset second frequency for a preset second time, judge the magnitude relationship between the indoor ambient temperature and the set temperature; If the indoor ambient temperature is less than or equal to the set temperature, control the compressor to stop; If the indoor ambient temperature is greater than the set temperature, judge the magnitude of the pipe temperature of the indoor unit; If the pipe temperature of the indoor unit is within a first temperature range, keep the frequency of the compressor unchanged; If the pipe temperature of the indoor unit is within a second temperature range, control the frequency of the compressor to the preset first frequency; If the pipe temperature of the indoor unit is within a third temperature range, control the compressor to stop to prevent the indoor unit from freezing; Wherein, the first temperature range > the second temperature range > the third temperature range, and the preset first frequency < the preset second frequency.

6. The control method of the parking air conditioner according to claim 2, wherein Control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit. It further includes: When the indoor load is a high load, control the frequency of the compressor to a preset third frequency; After the compressor operates at the preset third frequency for a preset third time, judge the magnitude relationship between the indoor ambient temperature and the set temperature; If the indoor ambient temperature is less than or equal to the set temperature, control the compressor to stop; If the indoor ambient temperature is greater than the set temperature, judge the magnitude of the pipe temperature of the indoor unit; If the pipe temperature of the indoor unit is within the first temperature range, keep the frequency of the compressor unchanged; If the pipe temperature of the indoor unit is within the second temperature range, control the frequency of the compressor to a preset second frequency; If the pipe temperature of the indoor unit is within the third temperature range, control the compressor to stop to prevent the indoor unit from freezing; Wherein, the first temperature range > the second temperature range > the third temperature range, and the preset second frequency < the preset third frequency.

7. A control device for an air conditioner, characterized in that, It includes: An acquisition unit configured to acquire the inlet air temperature and outlet air temperature of the indoor unit of the parking air conditioner, the indoor ambient temperature, and the pipe temperature of the indoor unit during the refrigeration operation of the parking air conditioner; A control unit configured to determine the magnitude of the indoor load according to the inlet air temperature, the outlet air temperature, and the indoor ambient temperature; The control unit is further configured to control the frequency of the compressor of the parking air conditioner according to the magnitude of the indoor load, the indoor ambient temperature, and the pipe temperature of the indoor unit.

8. A parking air conditioner, characterized in that, It includes: The control device of the air conditioner according to claim 7.

9. A storage medium, characterized in that, The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the control method of the parking air conditioner according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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